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Finding the Fourth Proportional to 121,874.68, 168,189.78 and 86,127.76

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Solution

The fourth proportional to 121,874.68, 168,189.78 and 86,127.76 is: 118,858.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,874.68 : 168,189.78 = 86,127.76 : x
  2. Step 2: Convert to fraction form
    121,874.68/168,189.78 = 86,127.76/x
  3. Step 3: Cross multiply
    121,874.68x = 168,189.78 × 86,127.76
  4. Step 4: Simplify right side
    121,874.68x = 14,485,809,006.29
  5. Step 5: Solve for x
    x = 14,485,809,006.29/121,874.68
  6. Step 6: Final answer
    x = 118,858.23

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.